Start the operation again from point 1 to point 5 as many times as the number of screen grabs you need

Mac OS X

Press "cmd" + "caps/shift" (the empty arrow pointing upwards) +"3" at the same time

Each time you press these keys, an image file is created on your computer's desktop

Apple iOS (iPhone, iPad...)

Press the "Power" + "Home" buttons at the same time (the only two physical buttons)

You will then find the screengrabs in your device's "Photos" app

Google Android (e.g. Samsung, LG or Sony)

Press the volume down (on the side) and the locking button at the same time

The image captured is then automatically saved in a Screenshots folder in the

Popup Windows

gallery. To copy-paste an error message present in a Windows popup in text form, simply hit "CTRL" + "C" on your keyboard to copy the message onto the clipboard... You can then paste it ("CTRL" + "V") in the body of the email you are sending.